Make drag-and-drop work with OOPIF-WebView.

content/browser/web_contents/web_contents_view_child_frame.h

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_CHILD_FRAME_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_CHILD_FRAME_H_
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/web_contents/web_contents_view.h"
@@ skipping 52 matching lines @@
                      const DragEventSourceInfo& event_info,
                      RenderWidgetHostImpl* source_rwh) override;
   void UpdateDragCursor(blink::WebDragOperation operation) override;
   void GotFocus() override;
   void TakeFocus(bool reverse) override;
 
  private:
   WebContentsView* GetOuterView();
   const WebContentsView* GetOuterView() const;
 
+  RenderViewHostDelegateView* GetOuterRVHDV();

[ncarter (slow), 2017/01/18 19:16:35]

It is unconventional to use an abbreviation like RVHDV (which doesn't appear
anywhere else in the code) in a method name, unless the abbreviation is
extremely well known (like ID, HTML, or URL). This should be spell it out with
words (maybe GetOuterDelegateView ? )

[paulmeyer, 2017/01/18 20:08:23]

Done.

+
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   // The delegate ownership is passed to WebContentsView.
   std::unique_ptr<WebContentsViewDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewChildFrame);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_CHILD_FRAME_H_